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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2781153e5703d7f27710e44fc6c2c7ff4b69308e4383016ef34b254397f19c4f' 
  AND token = 'xTHs44M9zaeYEM/+4CtzODj3roCCy4txS0U9fnAuk5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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