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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2766cecb4d8e12bb23b3d419a2da2581af580ae407992de4a4a37a08b844f34f' 
  AND token = '9c8Wz8k81c8MtMdW+9JN8TE0doQxsIFe5wORa9lBpOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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