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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e55aa0196d3ac5a1f40dfc1d973d53e11d40bd3917dfd2d1871229870c78f1e9' 
  AND token = '2bEZputXQiQQvMrUPMHVMqEnN2esARWveRg6J8WLUqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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