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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aac96eab8046e0e51b69190a422baab5a22de8969123ddfcee75aed29f133db0' 
  AND token = 'PWxMRJmfEOMuqjKO6T5n22qpp0vumcbG0JkdKr29vJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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