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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd4ea5f5aa18f8bd6e04faad1e0f763e06422c53fb590c304504692789d1c4872' 
  AND token = 'XDsY1S470rlOlJpWkg5Gf9OuJR94YHAlFcMlp+YNKXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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