Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe75a14dcb09bbc6f30374fc061d193bc2b3adfb2d21bf4325c3bbf30b1914c' 
  AND token = 'WMuf4vZsO6kFTlvJ/q2YdnAnj1fzqevqg+CvRg3OPao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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