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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a91e2e3572e922288c0843a4ddd80d633388290066576752c3a4a4671ce9385' 
  AND token = 'Q6UdSuMVHNJZeFilCnoOXVkbIs9laSrmH51VshtG/jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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