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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '71de7ca64367d94b0463fa8ea78763e232297cd395cb3c16a020bdbfb7438da4' 
  AND token = '/qnFSE49NlnsOWCaMek33tl8bsxDOKnPk0m05IGxaWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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