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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b343a8455c776dc910de97fee878aaf6bdf2a71c167fed5eb5337823bcb2f5df' 
  AND token = 'VG3JXsyG98Ns8oGoAlnCVl2UVBKkMoL+Y16Q75MYhs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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