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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe61328673d62be032fa08b0698e12abf5dd705324ca583a57f0eb47eb45da5a' 
  AND token = '9bBIX2l3Ef15s3mRY45IZR+O80er/8XKHtnyQFmmNOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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