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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee6b27ea8984efa5475bbc28d0c57c1913dc95c8d92c5a8df7a0b93a1f2cb5ee' 
  AND token = '39m+UO4s0V9CYTdptz6yoYML0d4kBSOvxT4oLuN5mH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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