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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cac50c6f628fe1ddb70019c5367c65764983952abb5545a5c9e28752739b1c8f' 
  AND token = 'xK5YT+lL/5EfpzlCaN4pJBMEr7dS3qxudFs1EBFXaKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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