SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a5340fbc4ba0145a0c619ff4f66cc0bc2127825b984a766dd800f5100b05517' 
  AND token = 'I+s6YcjJtQn0NpOx5dS/pGmQftgVglm+h/Q5kEGcXvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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