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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '033ed122e2f02f2fa4e9083c6ad6b26ed8d61e7c0a4bcb18a11abc8c0ea7ba91' 
  AND token = 'fW/cuAkG+zYlBIuM5ElKCUSVbPJN7+GkCHyPB+zbeuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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