SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '48899faa3308370db76d0658ee8cb2c430e2d66c8e4ff3f291b7665d9acfc060' 
  AND token = 'kJww9k2S4MUq1WtzNvcu4l7PVEB/4NYhxja2PZANUNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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