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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c2cd234c3012b00dcc54a5a45672832d33d0a1a89c56b506ba120ce61ac9ff16' 
  AND token = 'x+4Ha6JsHjPQnrO7PXZDNvlDqu26yF9aUAfCW2+/HRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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