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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8706fdaceab23cc761ea08f3e02e6d4ff4812197417fb5e89805bf47272e2769' 
  AND token = 'RtT2HhsWCQMH+bcsKjmoKyOZ964mkzeT7effocemVfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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