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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cfa4bfcfead33b54b0a6bc23be7d2c82624009eecc033cfeb803930c8f22e198' 
  AND token = 'MN91NCf7mFndTqErzAgXqub4CcakN8m8V2Z0NKvAo5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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