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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b6edce509395662a2c6e02ec2b2bd8dbc4bb4d28133220f165e137874c749073' 
  AND token = 'nL2biz36wJt4x/s/zxEyTdmWu7849M+ARGT9ZbyUqRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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