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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70cac1b0b08ce24b57ebd599a0ab785e16460566a3228f6d4931dc55fab70b01' 
  AND token = 'e5GDK8Uk5subGd1pQ4wrli2WZSW4Xy8ySxhLX4ME8yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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