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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2dd301c909bb5b9d5ffb0605e0e9d5734c4fe106cddaed1620002ddb022ba360' 
  AND token = 'jVYqPCNnWCqRvH44ESicqlh/mO6ynonV094KiV7tgfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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