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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb0f7cd69a111936b7a6f9436209ce0a04d751909b2b3acc1ae2e927c31ec23e' 
  AND token = '2tkssGjBkhIFzzA2N3BRjzQNViet/TcLNdK3nMBmZHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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