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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0eedbcaa70163aa8c84aa640e0e5f9edd1316c4ab9ea9f2ca77d81ae1b8ef676' 
  AND token = 'U2p0ZL2lAm5DSCW8H4mSN/AUXSyGlDaxdN9mo5McDKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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