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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '61cfa238fb3653aa40f3d34e41d7f3f59108db395eb3d69f5bce5fa0ea4b2a8a' 
  AND token = 'LnHZWqyIIidB3rGaOU8/Oa1qrces/t9NJMlmfKOsY1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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