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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4b358415075dc089db89a8343aaa00c9fa699ac90dae7ca96cbc81d6acba3553' 
  AND token = 'pG+IThbhMyYlDf5G3RTj64Dx4xunyHEFpN2AohjSf4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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