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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '593b4efff717afcd9b2e001fdd954c185b1a806b69a632536f9189a018058f54' 
  AND token = '1jE59cTWfmjmntXGtJnrauRnEl4JF7Ve7TEFNrxJsUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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