Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5a7db7f4d9fba9d4f36899ecb28a4944a19eabe3da3ad57654beb62b1592ea5' 
  AND token = 'v+Cex5rPsyT2YJL2CRUhQQfIhzELt3p1iUlSp1eTbDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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