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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f97d74acced7c7901d900850a21e93a95cd4b0f5d1b700a830d8dcbcf2073c9f' 
  AND token = 'Hc+xruZAje1/IOr5LWHSecEI7SbEkQsueF8CpJPKDCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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