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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e62ef5a40c157ab03dcad9795fdaeeb5c5eb45cf0aff9b6088eb7337e3f892e7' 
  AND token = 'FsqiRn5nhdSVfP8pj0Dx+zulhsXNnoeeY0rW7/Eh4fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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