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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a5efd06c07830d1de40d40fade5e0b13b50f90f74cb5e818485d871ed10d97d1' 
  AND token = 'n1rVyEc/44NB6TXYjJoLvWmKusLyl+9cUVBiOOXZtJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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