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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1525b708fca6dce3750b4824416dd706eeb0d6e0b06c0394e7c6f1fa34b432ba' 
  AND token = 'aDK08sIk82KbfjyWvSIk/e+SDJEouy7ZsY1yhobyYpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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