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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '17e7cf4889e038eba3c6760219133bfd7f515e64a58f483b0bd78d41556fbddf' 
  AND token = 'qUtDkKPWS4T5amkbn222XJGaZM7huH94g9uy8xV71D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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