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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '907952fe06f30eefea8b3d84608fd2897fae6cf6e8ad454a578823b8a041bcc6' 
  AND token = '3e9UQY4hVfenMPfq3XWu47vpkCcFYoET+1b+oCqEBqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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