Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae0b31c459c28f22522d4194d05f0db43fd1eda5d1a6332a7cd6e1855c2e4cc' 
  AND token = 'KSRw5ljuGrEe5McKuatLyTCu5ngxzFqu3ZT5vfuFHyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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