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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f164299771eacbdf7fe87887545d12c8a3402f8c8512a197ff6b981c9f3ce8db' 
  AND token = 'f3IYPA3o3uPFo9veVU7aEVn+My8pmscCFUkM0Y/swmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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