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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bcf71675cfc2ee2cfb89a6d0c02439e3f4a4b1f434d9a6cc5d0ed2a9f7440dbc' 
  AND token = 'iYl1+faqcd0NN0EZ7RfdZSMVreZGfws4aBRFZvO7w84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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