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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99d620ea3c23e87282b61e7538b04c9b170ae8acf1c8d9a472c514147a8a49b4' 
  AND token = 'Yh81X6Ch4GixjBLorbOyitHS1/9ohRNx5syeThVeWYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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