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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e8dc1c44e23b9d7965a3cadef8674e654a5e887606df86aea1dc30daf86f855' 
  AND token = 'NNlh3Lhn3xAhZtbzgiv7EbIDjqNF5OvOAx5JcaDEVCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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