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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '363b56e84597c3e02a92f8314970a05826835fe613c9d0d20566aedd65d27176' 
  AND token = '6z5oCLyAweAau8O2kHNVmJLg2kdmyK36j6l6Nf58HB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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