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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '380947c6a50615c9a85e43857b369c53975b8908504a0c998ed283426f7838a1' 
  AND token = 'UZHG5gZiL0yWNolAtpAZNRCmQTACb6MB8nQCuTF4VWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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