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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '394aae7e1cb11c576048f3fe782c170942dc84fa1db0232cbcd6280b1c81cf92' 
  AND token = '5B3aMeNJ/P4f3kXkKvtlrEApjjgM/el4+ub2m4oGVdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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