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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3d031cdbc4ba0e2e7740d6c74aa57a2e07930bac359e3aa05b974e43e0734689' 
  AND token = 'DzQ7kumjh+ZgubJ+28dz6JEhhgrZh5ico1QAi1KO39c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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