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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8624dbe39dbd7c198a0feeb01c1a353f8e3f2933e9d2e5a250f34d3cb0994c1c' 
  AND token = 'cQV0qsBsL4YF35Es5IadybYJwH/PBCc5jWznSayXjCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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