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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '730baa39cf985806f1d0def77887785868a5770070ef5d537cbbb08b331c9ca6' 
  AND token = '3Liu7z7mIrtMk93VAWuXqHNRQn2n1z7pp0Dhd5PMs00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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