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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a73f2409bd280e4eed8582ee6bec389ed672fa6e6192e65d594606061459b85d' 
  AND token = '7WYEwZFo7rk9AGcBGsz1kfZqUsBak3CAJ7XBxw5lWyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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