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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '14f2e966f574249656349094c5e578a6157757b0483f6b76d63c26f6188c966e' 
  AND token = 'tIARGu2IHXQz+HOwb48dJsNdkpENwNVPJODclNj5fi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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