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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c03e5eb8a7c0c377560b60fba37980c00bbdd83565f19a33e44357541518d68b' 
  AND token = 'waMedumLMfTaW4rO7dVW6L9llmKih7KEy9CHQIlNN20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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