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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ebf3c26801002cc3e447aafaf166a0f6320c93c7d72ad9462ad874e784b2d14' 
  AND token = 'o6br3gF6+Vxwt0Txgjablz/79EEFNzWQsNU+mnrkSYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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