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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26d3b9c3ded6111370d1a4754f6b1a7b0c080b908c59c559f2192fd3fb85512b' 
  AND token = 'ie/UwkDt4EtDWS96d+uhtdS9vAcQIwcTR8k4N+YUyYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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