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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f9825480aa74197843763d81d65a489c0ba1170fe9a0b1e07683e07036b1c51c' 
  AND token = '13YSNiIFxHnLCtx8cj/tpQ52AQkwCOSb7+KGnterOGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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