SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '655c3d452c67570fe2a0bf078f75e8c5e9183bdeb923c8cb08c698f7ecc0d4bc' 
  AND token = 'zgYEGwk7YrS3z+iNTjlNbhmNcRhibRBozTgJWgbZ/Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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