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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e6221ea3fb1809c67debe5b9cfd983e756fe8b555818124d6b7ef842417d42ca' 
  AND token = 's7f5B6trOq7P9yXf2x3G2Y7bR5bNulyy7SuvMhLNFmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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