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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8d6e8a1ed3ba79d886845b061cff4e622b778891f0694e6d5e591169b9f33286' 
  AND token = 'RAOm+W4vKkY8dKZoN4l/bX3ScaYM9iLEwNJwncfrMF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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