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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b532f4d14e7d7a9a36f08da7345400193048dc88727352ebd201ddab19e212c7' 
  AND token = 'puZxQvcJ5Jc8za/MwG9IyCGYfmu6Ufn7QzHSgafc32c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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