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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2393c2c593825af1d8ec038321006a0ec7c617ab1756392cc33289de8c261b59' 
  AND token = 'Cf3zWInP44+2GO+KUZs15HkUwV03Z7/9pEx074pizIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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