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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ed2175c2fe466055567bfe8caddaf8f6a81652c0bee086fa853462797a285a74' 
  AND token = 'uvW+i7GS8lqAku75BTmf/tSW3Ir5JFDK/OcpcVT9N0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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