Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587e8e3ad3cbeec294fb46d2e1456f2c30d00db83d93f4c0ddaa5e704c8ffdc1' 
  AND token = 're7f+4Op2Af2nQxJ0nPeo0SYcieEmys7r34r0uYjq6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}