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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '49ff12df551a6fe31581c58b810a8e9add3090cc90222c4acce1ac4934c9aa2b' 
  AND token = 'G8tYOezOmLi0FzeaA/I9smr7zAefDyI4TvGu9TX9l9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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