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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7b8cbd93260bd2a313bfe3b74623e77eb2e88016862970a56846db256003692d' 
  AND token = 'kD1rkPJF484KQ68+erQHnx+Xu+6I8OjMlsA1Lk4AXtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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