Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d38b0129bf2335a333fea39f47177fe1730816b78fb16ea80cbb48f2a79f28c' 
  AND token = '90yYqO6gWLsJH2uEFWISL+ySFCXY17F3kbUeR2YVXJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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