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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '185c83c1eecda186a2f1a4af2e7505bfd63c2dfda4da30c5e2d6235451cf4a10' 
  AND token = 'Si+AxlJw3dbUkwPYw5/A62ahbWEyjmeR1/8cnOroeeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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