SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '06c80422ac5b1a92fdc653d3f79693ea50faabcf6084a7b78418cba2867e7310' 
  AND token = 'eRaSZHpLKEtrJJLRT8O5EhKoR6Hn1zY1khUKueRDSvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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