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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '074c06a84ff6dc2e3f23ca7c5ba565353134c2c263bee8eaa788b3e93a5954bd' 
  AND token = 'HO1y3QwaFcSIl28RVxZTl6Hu/vZd4zJvnSuZlSLdj7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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