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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '20771be3030a953b1c934b8ba4ced60fd35e3298132a32921665ace889fd5b04' 
  AND token = 'G6i6bXH1f0cxwzdrIl8rGD5QwHtxJsCR5eKwJZdAO04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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