SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e4c766652db315a2613b71279933e5836c57c5061648a91e85f1f2fb5aab301' 
  AND token = 'YPgWdQOAjkx9LcspgFKbyQxIwmcekPcJVPEJZptdCJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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