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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c6a86c6a570964c26ea04b76d826526137e0c0e2dee0207f62ccb491acf2af74' 
  AND token = 'ou529ef/5TBynOCqTgdpEx5++mhS8XXV0bJuagUExYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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