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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'feb92770c86d9d82da4bfb5cc847e8e9e62addf74e2a9467818800333e864100' 
  AND token = '1E7vR6GzIFSoGgbfOKmN/Qgl6pSe/3ZvSHLjxj/y4aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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