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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0ff4f5b5d7923dae2cc3cb66aaac8c0d3d9074c54242bcd435116a3061eba59' 
  AND token = 'PI5n+/blEdx7zU0THqdVCXlCg6lQEFbt8TL2TjH3Bag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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