Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58946ceeb1c45a17e29ad8d5b2b0844178bb526807d665d75bb188964a474fb' 
  AND token = 'qfJD/uEFxDHQh/fOQuZ5tAFE+sC7MbNsF9Z0gy1TRtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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