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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6da1c2c84270c4d973f2cb384621ade652db5e598b7d8fb620c025baa07bc095' 
  AND token = 'rW5r46AH6k4n1uUO0nWkfTmfLpW3aPwgaQ2+5+9rb+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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