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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7df68d6fd1d4b15189211d874dbb516c5cbc956e781ca47bceca912641d8049d' 
  AND token = '2hx2jj8eZ1uyzBJs/3d8A4KIygKqlHyn+EzN6COEQic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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