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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93a076817b1a9e27112c8d1fe1b620dd5f5d0121675159606d2faa5741bf830a' 
  AND token = 'mu54GO0j0UdxbOl1LJaQYCvm1mQ5vPhwCE7mJe/xV88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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