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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39f2d2a26a1f238e0f27c53e1180019abf97223b4a0ccd07d5a842315f6ff0c8' 
  AND token = 'WKe2Apf+ddvP96NJ2IDKC1pHb2kBYKOEPugxV1C2HCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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