SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4732365e0e4adedb0fbf6031b51c239c1357a6150a0fc00fb244495a0b34b77b' 
  AND token = '+rXe981g0kE7oQndiviH7WYu+/lBYWKY77pwUCJdM44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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