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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e2361914733275355c97b64141b41474adfb4f41155e3a4e888afc0f94733ef7' 
  AND token = 'Loi72q+jVczfpzyjBMnmr7vOnkbAkXd8tLeOc+Os+0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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