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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1f56d89454339da813ed5d2aeb46342f0c25b64b54ca9df6386de88ba8a04950' 
  AND token = 'n0qzZ7pdx+10398o3k0z62jwX5NdXira6IpgfnXiDAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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