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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03355938a7196d268ea2a09734a3737c53254cc063685bdf24275bc1e7dd04b3' 
  AND token = 'rxUQjtna2UTll8sA8yuqbUm4OkOVTcwd3EY17OEf5p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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